1、SPECIFICATIONS: This guitar file set includes a flat file and 22 round rod files, including 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 2.0mm, 2.1mm, 2.2mm, 2.4mm, 2.5mm, 2.7mm, 3.0mm. 2、UNIVERSAL DESIGN: String nut and bridge file set, universal design, which is suitable for various stringed instruments, including guitar, mandolin, bass, ukulele, and banjo, with strong compatibility. 3、PRODUCT USAGE: Round rod file is suitable for grinding string slots, making them glossy and beautiful. The flat file is suitable for polishing nut and bridge, making it convenient and practical. 4、METAL MATERIALS: These guitar polishing files are made of excellent stainless steel and carbon steel, with high hardness, impact resistance, no deformation or breakage, and a long service life. 5、CONVENIENT USE: These files have a compact size, making them easy to enter the slot. Meet the repair needs of guitar strings, fingerboards, and nuts, suitable for home DIY and professional repair.